to answer your questions in order, I would say:
- yes, to the point mentioned above
- yes, unless you know there are audio or major video differences (tho there’s no guidance on how to split video recordings currently). video resolution likely isn’t a major enough difference, but aspect ratio might be
- yes, because they have very different contents
- I’ve personally been leaving the release type blank for video releases (especially video singles) as there’s currently no guidance on that
- yes, I would use Live if it’s a live recording
- I generally err on the side of seperate entities, so I would keep them in seperate release groups. they could always be merged later once a consensus is reached (see the thread below)
- I’d go both, as appropriate
there is an open discussion on how to handle video as releases in MusicBrainz, I’ll link it below